Elevator-indicator



(N0 Modl.)

S. EVANS & T. J. DAVIS.

ELEVATOR INDIUATOR.

No. 368,822. Patented Aug. 23, 1887.

49mm gl l wc/wbo as Q/JMM m- NITED STATES rricn.

PATENT SAMUEL EVANS AND THOMAS J. DAVIS, OF J OLIETT, PENNSYLVANIA.

ELEVATOR-INDICATOR.

SPECIFICATION forming part of Letters Patent No. 368,822, dated August23, 1887.

Application filed June 10, 1887. Serial No. 240.963. (No model.)

T aZZ whom it may concern.-

Be it known that we, SAMUEL Evans and THOMAS J. DAVIS, citizens of theUnited States,

. residing at J oliett, in the county of Schuylkill and State ofPennsylvania, have invented cer= tain new and useful Improvements inIndicators for Elevators, of which the following is a specification,reference being had therein to the accompanying drawings.

The object of this invention is to provide an indicator to be employedin connection with the elevating machinery of mining shafts and slopesto indicate to the engineer having charge of the engine which operatesthe drum the position of the car or cars, so that he may know when toslack or slow up previous to stopping the machinery, in order to preventaccidents from a too sudden stoppage of the same, as more fullyhereinafter setforth.

In the general practice of mining-engineer- 'ing at present the shaftsor slopes are of considerable length, and in order to save timeinelevating and lowering the cars the drum is run very rapidly during agreater portion of the time occupied in working the cars. This rapidmotion, however, if continued up tothe stopping-point of the cars,would, when suddenly stopped, cause, the ropes or cables to break andproduce serious accidents; hence it is necessary to slack or slow up themotion when the cars reach near the end of their travel, which hashitherto been accomplished by knotting the rope or cable at a suitablepoint or by making a mark at a suitable point on the drum which willindicate to the engineer the proper time to slack or slow up. This meansis inadequate, as the engineer is often unable to detcct the knot ormark in sufficient time to slack or slow up properly, and is the causeof frequent accidents.

Our invention is designed to overcome this defect, and such object weattain by the means illustrated in the accompanying drawings, in which-Figure 1 represents a front view of my improved indicator; Fig. 2, alongitudinal vertical sectional view of the same; Fig. 8, a transversevertical sectional view of the apparatus, and Fig. 4 a detachedperspective view of one of the indicating-arms and the rock-shaft onwhich it is mounted.

In the elevating mechanism employed in mining operations two cars aregenerally employed, one car being elevated while the other is beinglowered, and for this reason our improved indicator is constructed withduplicate indicators or pointers, one of which is arranged to act at theapp roach of each car to itslanding.

In the accompanying drawings, the letter A indicates the frame-Work ofour improved in dicating mechanism, and B a shaft, which is connectedwith the drum-shaft of the elevator by means of suitable gearing, so asto be moved thereby. The said shaft is provided with a worm, (l,whichgears with aworm gear-wheel, D, on the shaft of an indicatonfinger,E,which is arranged to rotate in front of an indicatordisk, F, rigidlysecured to the frame. The said worm v(l also intergears with areciprocating rackbar, G, arranged to travel in ways H, secured to thebase of the frame A. The said rack-bar is grooved longitudinally, asindicated by the letter I, and is provided with adjustable tappet-pinsL, which engage the tappet-arms M onthe shafts N, which are journaled inbearings inthe uprights of the frame A. To the front ends of the saidshafts are secured the indicating-arms P It, which indicate the time forslacking and stopping the motion of the engine. The free ends of thesearms travel in front of the segments S which, at suitable points, T, aremarked to show when the slacking or slowing up is to take place, and atU to indicate the stopping point. The shafts N are also provided withweighted arms W to hold theindicating-arms normally down.

The operation of our invention is as follows: The machinerybeing putinmotion, isrun rapidly until the cars are near the ends of theirrespective routes. The tappet-pin at one end of the traveling rack-barthen engages the lover of one of the indicating-arms P or B and carriesit up in front of the segment toward the slacking or slowing up mark,attracting the at tention of the engineer and indicating to him when toslack or slow up and when to stop. The intermediate or disk indicatorserves to show the exact position of the cars in the shaft or slope, soas to enable the engineer to be always on the watch.

Having thus described our invention, what We claim, and desire to secureby Letters Patent, is

1. The combinatiomwith the shaft receiving its motion from the elevatingmechanism, of the worm mounted thereon, the intergearing wormwheel andindicator-shaft, the indicator, and dial-disk, whereby the position ofthe cars in the shaft or slope is indicated to the engineer in charge ofthe elevating apparatus, substantially as specified.

2. The combination,with the shaft receiving its motion from theelevating mechanism, of the worm mounted thereon, the intergearingreciprocating rack bar, the tappet pins adjustably secured to the same,and the indicator-shafts having indicating-arms, tappetarms, andWeighted arms, and the marked segments whereby the periods for slackingor slowing up the machinery is indicated to the engineer in charge,substantially as specified.

3. The combination,with the shaft receiving its motion from theelevating mechanism,of the worm mounted thereon, the intergearin gwormwheel and reciprocating rack-bar, and the indicating-armssecured tothe respective shafts, whereby the position of the cars is shown and thepoints for slacking or slowing up and stopping the machinery indicated,substantially as specified;

In testimony whereof we affix our signatures in presence of twowitnesses.

SAMUEL EVANS. THOMAS J. DAVIS.

Witnesses:

EZRA CooKILL, WM. H. YARNELL.

